Unfortunately, they are full of shit. They posted this in December (a month after they supposedly started at NoA? Pretty quick work...)
There hasn't been any update to TotK, i'm very doubtful any employee would still have their employment if they had leaked something like this, and they just edited out someone else's name to put themselves in the screen (the lazy way, couldn't even move all of the names down?):
The TTYD story itself doesn't add up regardless; they claim their position at NoA is "Environmental Engineer" (they probably meant Environmental Artist, but that's not someone who would be on a localisation team anyway), and given the game was seemingly complete ahead of the announcement in September the timeline they present could not be true either.
Still hopeful the remake will do the right thing and make Vivian openly trans (and presented positively) in all regions, but this person wouldn't know.